1EA7:
reference: The 0.93A crystal structure of sphericase: a calcium-loaded serine protease from Bacillus sphaericus., Almog O, Gonzalez A, Klein D, Greenblatt HM, Braun S, Shoham G, J Mol Biol. 2003 Oct 3;332(5):1071-82. PMID: 14499610

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).